Effects of chemical composition on the rate and temporal pattern of decomposition in grassland species leaf litter
Effects of chemical composition on the rate and temporal pattern of decomposition in grassland species leaf litter
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DOI：
10.1111/j.1744-697x.2008.00103.x
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发表时间：
2008-03
影响因子：
1.3
通讯作者：
M. Hossain;S. Sugiyama
中科院分区：
文献类型：
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作者：
M. Hossain;S. Sugiyama
研究了15种草地植物凋落物的化学成分对分解速率和时间格局的影响。在实验室条件下，定期测量不同树种叶片处理后15天、30天、45天和60天的土壤呼吸速率(CO2通量)，以监测土壤分解的时间变化。结果表明，四种植物的土壤呼吸速率在所有四个测量时段都有显著差异。前期(15d)土壤呼吸速率与叶片含氮量呈显著正相关，后期(30~60d)土壤呼吸速率与凋落物类型的酚氮比显著相关，表明凋落物对化学物质的贡献随分解过程的进展而变化。单相指数衰减曲线较好地反映了土壤呼吸速率的时间变化。土壤呼吸随时间的相对下降速率在不同植物间差异显著，与凋落物N含量呈显著正相关，与凋落物单宁含量呈负相关，表明凋落物化学成分对分解时间格局的重要性。这些结果表明了在时间尺度上测量土壤CO2通量的重要性。
We examined the effects of the chemical composition of leaf litter on the rate and temporal pattern of decomposition for 15 grassland plant species. Respiration rates (CO2 flux) of soil treated with leaf sections of each species were measured periodically at 15 days, 30 days, 45 days and 60 days after incubation under laboratory conditions to monitor temporal changes in decomposition. Results showed that soil respiration rates of the plant species differed significantly at all four measurement times. The soil respiration rate at the earliest measurement (15 days) was positively correlated with the leaf N content, but the rates at the later measurements (30–60 days) were significantly correlated with the phenol : N ratios of litter types, indicating that contribution of litter chemicals changes with progression of decomposition processes. The one-phase exponential decay curve well represented the temporal changes in the soil respiration rate. The relative rate of decline in soil respiration with time differed significantly among the plant species, and it was correlated significantly and positively with litter N content and negatively with the litter tannin content, indicating importance of litter chemical composition on temporal pattern of decomposition. These results indicate the importance of soil CO2 flux measurements at temporal scale.